Throttle valve for pneumatic tools



Sept. 30, 1952 TERRY` 2,612,342

OTTLE VALVE FOR PNEUMA Filed Oct. 18. 1947 33 %l//l//l//l// /l/l/l/l/l/l/ll IN V EN TOR.

- JACK E; TERE Y I, V Jack E. Terry, North Royalton, Ohio, assignor, by mesne assignmets, to superior Pneumatic &

Application October 18, 194 7, ser Noym s,

1 Claim. c.-2 51-37 Th presentinvention relates to Q fli- ;valve for pneumatic tools or the like.'

An object of the present invention -is"'to"pro- *vide* a'- plu'nger'operated valv'e `for a pneumatic Manufacturing; Inc., G

arficld Heights, Ohio, a r

'ber through which the :bore 23 extends fis of` reduced diameter relative to the diameter" 'of recess 19 so that'an'annular passage is formed about the member. The member is bored 'trans f tool by which the flow of 'air to the tool maybe 5 versely as at 26 for forming'air passages which *throt'tled and controlled-to obtain the exact, deinterconnect central passage 23 'and the interier sired flow of air to the tool. of the' recess !9. f

Another object of theinvention is to provide A valve stem 28 extendsjthrough the passage avalve'of'the character'referred to which may -23 and into the cavity s; -The'inner end of bejeasily' manufactured and which will provide `the stem has a disk-'likefvalve' plate 29 atta'ched 'long 'trouble' free service, 'thereto which is adapted'{'to-'seat on the 'an- Other' objects and advantages of the invennular valve seat 22 for closing passage 23. The tion will be apparent from the following descripvalve stem has a conical section thereon which tion of a preferred form of the invention, referis flared outwardly toward the valve plate as ence being made to the accompanying drawings indicated at 30. The base of the 'conical secwherein: tion thereof is substantially the same as the Fig. 1 is a longitudinal sectional View of a diameter of thepassage 23 so that substantially hand operated blow gun; all passage of air will be blocked when the coni- Fig. 2 is a fragmentary View similar to that cal section is within passage 23.` It will be seen of Fig. 1 but showing certain parts of the valve 0 that as the stem 28 is moved inwardly relative mechanism in a different position than that to the cavity-!8 the conical 'section 30,` passing shown in Fig. 1; and, from the entrance to passage 23 and into cavity Fig. 3 is a view in section taken substantially l8, will gradually increase the effective openon line 3 3 of Fig. 2. I ing from the cavity !8 into the passage 23 so The valve of my invention may be used in 25 thatanicely controlled flow of air can be effected various types of pneumatic tools, but for the by the proper positioning of the stem 28 in the purpose of illustrating the invention Ihave shown passage 23. It will be noted that the said valve the valve incorporated in a hand manipulated plate or' head 29 has a cross sectional clearance blow gun which is used for clearing surfaces of with the bore of the cavity` IB which is greater ioose particles by directing a stream of air against than the cross sectional clearance between the the particles. The blow gun is preferably formed 30 small end of the conical portion of the valve stem' i of a casting having a handle portion n and a and'the bore of the valve seat member. The nozzle portion ll. A finger operated' valve outer end of the stem 28is provided with a mechanism l2 is disposed intermediate the presser button 33, which :button closely fits the handle and the nozzle portion ll for controlling counterbore 24 for preventing escaping of air the flow of air through the gun. The handle about the button and the inner face of the butporticn n is bored longitudinally at I4 and ton is acted on by the pressure in the countercounterbored at l5 adjacent the :butt of the bore 24. It will be apparent that the valve handle, and preferably the counterbore is stem 28 may be actuated by pressing the butthreaded as at !6 for attaching the nipple of ton inwardly, and that pressure in the cavity bean air supply line thereto. 'A cavity !8 is formed 40 hind the valve head acts in concert with presin the casting, as by boring, and the upper end sure on the Operating means to resist sudden of thebore [4 enters the cavity l8. The outer opening of the valve. The valve stem 28 is norend of cavity l8 is counterbored and threaded mally urged toward the valve closing position by to form a recess as indicated at 19 for receiving 'a coil spring 34 interposed between the inner end a tubular valve seat member 20 which is threaded of the cavity [8 and the valve p1ate29 so that into the recess 19. The inner end of the memthe positioning of the valve stem by the finger' ber 20 is provided with a tapered end portion u of the operator may be accurately controlled. which projects into the cavity s and which 'Air passing through passage 23 escapes through ;forms an annular valve seat 22. Preferably an passages 26 and into the recess !9. A passage air-tight fit is effected between the walls of the 35 leads from recess IS upwardly to a bore 36, cavity I 8 and the inner end of the valve seat which bore is counterbored and threaded as at member. The valve seat member 20 is provided 38 for the attachment of a nozzle (not shown) with two aligned bores 23 and 24, the boreto the gun, if desired, through which air is dior counterbore 24 being of larger diameter than rected by the operator to the point desired. that of 23. The portionrof the valve seat mem- It will be apparent that the operator may control the valve so that the flow of air through the gun will range from zero to full blast, as desired by the operator. Also, the valve is easily assembled and* the parts lend themselves to ready manufacture.

As mentioned hereinbefore, the valve has many applications other than for ?blow .guns. r For ex-' amplefit is ;particularly suited for controlling hand operated pneumatic hammers and chisels.

Although I have described but one form of the;

invention, other forms might be adopted, all

slightly less than the inner diameter of the bore and a fianged head within the cavity seating on said valve seat, said head having a. cross sectional clearance with the bore of the cavity which is greater than the cross sectional clearance between the small end of the conical portion of the" valve stem-and the bore ofsthe valve seat falling within the scope of' the`c1aim which 'fbilows.,

Iclaim: p r A throttle valve for a pneumatiotool compr-is-,

ing a housing having a recess extending from its' exterior and terminating in a .generally cy1indrical deep cavity, a high pressure pass'ag'e"1ea'd-' ing into the cavity, a low pressure passage lead ing from adjacent the-outer end of the recess,

` a valveseatmember within .the outer end ofthe eess,` .said valve seat. member havingwa bore rtherethrough .counterbored .at its outer -endrfand an. o`tlet through its wall arranged tocommunicate with the lowpressure passage, said@ .seat; ..member. being provided with an inwardly "faeing seat, a valve stern within thebore. of` the :seat member; operating means on `the-:external en er said stern forming aclose fitwithin said counterboreand.said valve stem having a fr-ustro- .conical section-"whose larger diameter is just .memb*erwhereby the pressur'e ini-'the eavity behind the'valve head acts in concert with pressure on the Operating means to resist sudden opening of the valve.

" JACK E. TERRY.

p ZERENCES CITED The' following references are of record in the e UNITED 'STATES VPATENTS 

